New monoazo-dyestuffs



United States 2,799,673 NEW MONOAZO-DYESTUFFS Hans Bolliger, Basel, Switzerland, assignor t Ciba Limited, Basel, Switzerland, a Swiss firm No Drawingv Application December 13,1954,

Serial No. 574,967

Claims priority, application Switzerland December 15, 1953 6 Claims. (Cl. 260-163) This invention provides valuable new monoazo-dyestuffs, which contain a sulfonic acid amide group to the nitrogen atom of which is bound through a CO group 'an alkyl group containing a halogen atom.

The said halogen atom may be present in a fi-position, but advantageously in an tit-position, of the. aliphatic radical which is bound through a CO- group to the nitrogen atom of the sulfonicacid amide group. The said nitrogen atom may contain as a further substitueut an aliphatic, cycloaliphatic, araliphatic or aromatic radical. Especially valuable arev those dyestulfs which contain at least one sulfonic acid amide group of theformula in which n represents a whole number, preferably one.

In addition to a group of the latter kind of dyestutfs of this invention may contain further substitutents usual in monoazo-dyestuffs, such as additional groups imparting solubility, for example, an -SO2NH2 group, a sulfone group such as a methyl sulfone group, a carboxylic acid or sulfonic acid group, or substitutents which do not impart solubility, such as halogen atoms or nitro, acylamino, alkyl or alkoxy groups.

The invention also includes a process for making the aforesaid dyestuffs, wherein there is introduced into the} boxylic acid halide, so that the sulfonic acid amide group is converted, for example, into a group of the Formula 1 above. I I g As aliphatic carboxylic acid halides or anhydrides there may be mentioned aor ,B-chloropropionic acid chloride,

bromacetyl bromide andchloroacetyl chloride, and also the corresponding halogen-alkyl-carboxylic'anhydrides.

The starting materials containing a sulfonic acida'mide atent 2,799,673 Patented July 16, 1957 2 amino or 2-hydroxynaphthalene-6-sulfonic acid amide and pyrazolones, especially B-methyl-S-pyrazolones such as '1-,( u-napththyl) -3-methyl-5 -pyrazolone-4-sulfonic acid amide, l-phenyl-S-meth.yl-5-pyrazolones-2- or -3- or 5 -4'-sulfonic acid, amide, 1-phenyl3-methyl-5-pyrazolone- 2'- or -3- or -4'-sulfonic acid methylamide or l-phenyl- 3methyl-5 pyrazolone-2'-chloro-5-sulfonic acid amide.

' (B) Components free from sulfonic acid amide groups, which are to be combined with components mentioned under (A), such as diazo-compounds of aniline, orthoor metaor para-chloraniline, 2:S-dichloro-l-aminobenzene, nitranilines, toluidines and also 1-aminobenezene-3-. or -4-methyl sulfone, 1-aminobenzene-3- or -4-sulfonic acid amide, l-aminobenzene-3 or 4-sulfonic acid or l-amino- 2-hydroxynaphthalenesulfonic acid and coupling components especially pyrazolones such as l-phenyl-B-methylv 5-pyrazolone, 1-(2- or 3- or 4-chlorophenyl)-3-methyl- S-pyrazolone, 1-(4-nitrophenyl)-3-methyl-5-pyrazolone, 1-phenyl-3-methyl-5-pyrazolone-3- or -4-sulfonic acid or l-phenyl-5-pyrazolone-3-carboxylic acid.

Some of the monoazo-dyestufls are known which are obtainable by coupling a diazo compound specified under (B) with a coupling component specified under (A) or above all by coupling a diazo compound specified under (A) with a coupling component specified under (A) or (B), in an alkaline, neutral or acid medium.

The dyestufis containing a sulfonic acid amide group, and obtainable as described above, may be reacted with the aforesaid aliphatic halogen-carboxylic acid halides or anhydrides in an anhydrous inert solvent such as dioxane tetrahydrofurane, toleuene, xylene, benzene, methyl ethyl ketone, ethyl acetate or the like, or in an aqueous medium, advantageously in the presenceof a tertiary organic base such as pyridine, or in'the presence of an alkali.

It is of advantage to use an excess of the acid halide a or anhydride, that is to say, to use a proportion of an acid halide greater than is necessary to react with the acylatable sulfonic acid amide groups of the dyestufi present in the reaction mixture.

After the reaction, the new dyestufis may be isolated, for example, by salting out from the reaction medium and filtration.

The dyestuffs so obtained are new. They are monoazodyestufis, preferably of the pyrazolone series, which contain a sulfonic acid amide group of the formula group can be made by the usual methods, for example, I

by coupling together the following diazo compounds and coupling components: K

(A) Components containing sulfonic acid amide groups, such as diazo-compounds of 1-aminobenzene-2- or -3- or -4-sulfonic acid amide, l-aminobeuzene-Z- or -3- or -4-sulfonic acid methylamide, .ethylamide, butylamide, hexylamide or phenylamide, 4-methyl-1-amino-benzene- 2- or -3-sulfonic acid amide, Z-methoxy-l amino-benzene- 3- or -4- or -5-sulfonic acid amide or Z-amino-napthalene- 6-su1fonic acid amide and coupling components such as parts and percentages in which X represents a hydrogen atom or a hydrocarbon radical, and B represents an aliphatic radical, which contains a halogen atom, advantageously a chlorine atom, in the ,6- or OL-pOSltlOIl, provided that, when X represents a hydrocarbon radical, the dyestuif must contain a group imparting solubility, advantageously a sulfonic acid group.

The new dyestufls can be used for dyeing or printing a very wide variety of materials, especially nitrogenous natural or artificial fibers, such as leather, silk, wool, or structures of superpolyamides or superpolyurethanes.

They can be used for dyeing from weakly acid, neutral to weakly alkaline baths.

3 volume being the same as that of the kilogram to the liter:

Example 1 39.2 parts of the dyestutf obtained in the usual manner from 1-(2-chlorophenyl)-3-methyl-5-pyrazolone and diazotized l-aminobenzene-El-sulfonic acid amide are dissolved in 200 parts of dioxane with the addition of 50 parts by volume of a sodium hydroxide solution of 30 percent strength. After cooling the mixture to +5 C., there is introduced dropwise in the course of /z hour a solution of 22.6 parts of chloracetyl chloride in 50 parts of dioxane. When the addition is complete, the pH value is adjusted to 5-6 by the addition of a small amount of acetic acid. After the addition of 500 parts of water the whole is heated to 50 C., and the clear solution is mixed, while stirring, with 100 parts of sodium chloride. By filtering ofi the precipitated product, washing it with sodium chloride solution of percent strength and drying it at about 60 C. in vacuo, there is obtained the dyestuif of the formula in the form of a red-yellow powder. It dissolves in water with a yellow coloration, and dyes wool from a neutral to weakly acid bath pure yellow tints of excellent fastness to washing, fulling and light.

Similar dyestuffs are obtained by using any one of the dyestulfs of the following formulae, and otherwise proceeding in an analogous manner:

Example 2 32.6 parts of the dyestufi obtained in the usual' manner from 2-arninonaphthalene-6-sulfonic acid amide and diazotized aminobenzene are aftertreated in dioxane with chloracetyl chloride and caustic soda solutionof 30 percent strength according to Example 1. The dyestuff of the formula ITTH:

is obtained as a pale red powder which dissolves in water to give an orange coloration and dyes wool from a neutral, to weakly acid bath orange tints of excellent fast ness to washing and fulling.

Example 3 (I) H U 8 SOzNH-COCHr-Cl SOzNH-C O-CHz-Cl in the form of a red powder. The new dyestuft dissolves in water with a yellow-red coloration and dyes wool from a neutral to weakly acid bath orange tints of excellent fastness to washing and fulling.

Example 4 0.6 part of the dyestuflf obtained as described in the first paragraph of Example 1 is dissolved in 300 parts of Water, 10 parts of crystalline sodium sulfate are added, and parts of well wetted wool are entered at 40-50 C. into the dyebath so prepared. After the addition of 2 parts of acetic acid of 40 percent strength, the bath is raised to the boil in the course of /2 hour, and dyeing is continued at the boil for hour. The wool is then rinsed in cold water and dried. There is obtained a level, pure yellow dyeing of excellent fastness to washing, fulling and light.

A uniform yellow dyeing of similar fastness is obtained by the same procedure, but without the addition of acetic acid to the dyebath.

What is claimed is:

1. A pyrazolone dyestufi of the formula wherein n represents a whole number which is at most 2, Y represents a member selected from the group consisting of a hydrogen and a chlorine atom, one X represents a hydrogen atom and the other X the sulfonic acid amide group of the formula -SOz-NH--CO-CH2CI 2. The dyestufi of the formula AH; S Or-NH O -CHr-Cl 3. The dyestufi of the formula Or-NH O CHr-Cl 4. The dyestufl of the formula Og-NH O JJ-CHaOl 6. The dyestufi of the formula References Cited in the file of this patent UNITED STATES PATENTS Hitch et a1. Sept. 12, 1939 Knecht et a1 July 11, 1944 UNITED STATES PATENT OFFICE Certificate of Correction Patent No. 2,799,673 July 16, 1957 Hans Bolliger It is hereb certified that error appears in the rinted specification-of the above num ered patent requiring correction an that the said Letters Patent should read as corrected below.

Column 1, line 33, for of, second occurrence, read the; column 2, line 3, for l-(a-napththyl read 1-(a-napthyl)- line 31, for toleuene, read toluene,; column 4, lines 1 to 7, Example 1, the formula should appear as shown below instead of as in the patentcm 5 01 (L \N 6H om line 30, for diozotized read diazotized.

Signed and sealed this 1st day of October 1957.

Attest: KARL H. AXLINE, ROBERT C. WATSON, Attesting Oficer. Commissioner of Patents. 

1. A PYRAZOLONE DYESTUFF OF THE FORMULAA 